Python. How to remove zeroes from a list in Python [duplicate]

Question

X = [0,5,0,0,3,1,15,0,12]

for value in range(0,len(X)):

    if X[value] <= 0:
        del X[value]
        print(X)
print(X)

I run the code but then i get an error saying that the list is out of index range. Can someone please help me out on how to correct this mistake

You have your data structures mixed up- del X[value] is what you would use if you were accessing a dictionary, X is a list — Benjamin James
– Benjamin James, Commented Apr 23, 2018 at 5:19
Thanks. I recently started programming so i dont know the differences. But thanks for the help. I really appreciate it. I have to learn these stuff for my exam on Tuesday — Andrews
– Andrews, Commented Apr 23, 2018 at 5:30

JahKnows · Accepted Answer · 2018-04-23 05:09:52Z

51

Try a list comprehension.

X = [0,5,0,0,3,1,15,0,12]
X = [i for i in X if i != 0]

answered Apr 23, 2018 at 5:09

JahKnows

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Comments

pramesh · Accepted Answer · 2018-04-23 05:09:44Z

14

>>> X = [0,5,0,0,3,1,15,0,12]
>>> list(filter(lambda num: num != 0, X))
[5, 3, 1, 15, 12]

answered Apr 23, 2018 at 5:09

pramesh

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Thanks. And I have a question. I have seen the function lambda on multiple questions. What does it actually do. Thanks

lambda functions are one line anonymous functions